Implement wp_viewporter support for video buffer formats

Some EGL image formats (the YUV formats specifically) cannot
be handled by the built-in node types in the Qt Quick scene
graph and use a custom material and geometry setup.

In this setup, the wp_viewporter source rectangle was ignored
and the entire texture was always sampled. This caused problems
e.g. for video frames supplied by GStreamer.

[ChangeLog][Extensions] Support for wp_viewporter extended to
cover less common buffer formats.

Pick-to: 5.15 6.1 6.2
Task-number: QTBUG-95464
Change-Id: I2504c6cd7d82e17d28e930a59d9ec71b25779acb
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/compositor/compositor_api/qwaylandquickitem.cpp b/src/compositor/compositor_api/qwaylandquickitem.cpp
index bf165b15..ace1b6ad 100644
--- a/src/compositor/compositor_api/qwaylandquickitem.cpp
+++ b/src/compositor/compositor_api/qwaylandquickitem.cpp
@@ -1531,7 +1531,17 @@ QSGNode *QWaylandQuickItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeDat
         material->bind();
     }
 
-    QSGGeometry::updateTexturedRectGeometry(geometry, rect, QRectF(0, 0, 1, 1));
+    const QSize surfaceSize = ref.size() / surface()->bufferScale();
+    const QRectF sourceGeometry = surface()->sourceGeometry();
+    const QRectF normalizedCoordinates =
+            sourceGeometry.isValid()
+            ? QRectF(sourceGeometry.x() / surfaceSize.width(),
+                     sourceGeometry.y() / surfaceSize.height(),
+                     sourceGeometry.width() / surfaceSize.width(),
+                     sourceGeometry.height() / surfaceSize.height())
+            : QRectF(0, 0, 1, 1);
+
+    QSGGeometry::updateTexturedRectGeometry(geometry, rect, normalizedCoordinates);
 
     node->setGeometry(geometry);
     node->setFlag(QSGNode::OwnsGeometry, true);